<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>特殊字符</title>
</head>

<body>
    <p>
        &lt;html&gt;
    </p>
    <p>
        hello&nbsp;&nbsp;&nbsp;&nbsp;world&#8704;
    </p>
</body>

</html>